# Top **URL:** https://discourse.slicer.org/top.md?page=5 [Latest](https://discourse.slicer.org/latest.md) · [Categories](https://discourse.slicer.org/categories.md) · [Tags](https://discourse.slicer.org/tags.md) **Page:** 6 --- ## [How to get the clicked markup node in the 3D view?](https://discourse.slicer.org/t/how-to-get-the-clicked-markup-node-in-the-3d-view/46937)
**Author:** [@NogginBops](https://discourse.slicer.org/u/NogginBops)\ **Replies:** 4\ **Last updated:** [May 7, 2026, 2:31pm UTC](https://discourse.slicer.org/t/how-to-get-the-clicked-markup-node-in-the-3d-view/46937 "2026-05-07T14:31:35Z")
Hi, I’m interested in knowing what node is selected/hovered by the mouse when the left mouse button is pressed. I’ve tried using the scene interactor and trying to use the vtk picker, but I’m not really able to get it … --- ## [Visualization of continuous uncertainty maps in 3D Slicer (volume appears uniform color)](https://discourse.slicer.org/t/visualization-of-continuous-uncertainty-maps-in-3d-slicer-volume-appears-uniform-color/46892)
**Author:** [@Alexia\_Canosa\_Rojo](https://discourse.slicer.org/u/Alexia_Canosa_Rojo)\ **Replies:** 4\ **Last updated:** [May 2, 2026, 3:21pm UTC](https://discourse.slicer.org/t/visualization-of-continuous-uncertainty-maps-in-3d-slicer-volume-appears-uniform-color/46892 "2026-05-02T15:21:55Z")
Hi, I am trying to visualize a continuous uncertainty map (entropy-based) generated from a deep learning segmentation model in 3D Slicer. The NIfTI file contains floating-point values (not binary), with a range approxi… --- ## [Surface model turns black under transformation](https://discourse.slicer.org/t/surface-model-turns-black-under-transformation/46065)
**Author:** [@mikebind](https://discourse.slicer.org/u/mikebind)\ **Replies:** 4\ **Last updated:** [February 5, 2026, 7:01pm UTC](https://discourse.slicer.org/t/surface-model-turns-black-under-transformation/46065 "2026-02-05T19:01:19Z")
When I reflect a model node using a linear transform node that has a reflection, the visualization of it in 3D unexpectedly turns black. I gather from other posts and LLM consultation that this is because a transform wi… --- ## [I can't remove the slice visibility in my 3d views...](https://discourse.slicer.org/t/i-cant-remove-the-slice-visibility-in-my-3d-views/45725)
**Author:** [@Nednao](https://discourse.slicer.org/u/Nednao)\ **Replies:** 4\ **Last updated:** [January 10, 2026, 4:49pm UTC](https://discourse.slicer.org/t/i-cant-remove-the-slice-visibility-in-my-3d-views/45725 "2026-01-10T16:49:39Z")
Hi everyone, I hope you’re all doing well. I have a small problem in my 3D view. There is an orange outline displaying the Dorso-Ventral slice visibility of my specimen. I know that I can enable this kind of option by c… --- ## [Write 3D model to CT images](https://discourse.slicer.org/t/write-3d-model-to-ct-images/47587)
**Author:** [@KarelPenicka](https://discourse.slicer.org/u/KarelPenicka)\ **Replies:** 3\ **Last updated:** [July 13, 2026, 11:13am UTC](https://discourse.slicer.org/t/write-3d-model-to-ct-images/47587 "2026-07-13T11:13:03Z")
Hello gentlemen. I have a 3D model of a mirrored healthy femur proximally aligned to the operated femur. In the 3D slicer I can see the difference and how they are superimposed. But I would like to write the 3D model int… --- ## [Body composition measurements (sma, smd, sat, vat) at L3 level](https://discourse.slicer.org/t/body-composition-measurements-sma-smd-sat-vat-at-l3-level/45751)
**Author:** [@goz](https://discourse.slicer.org/u/goz)\ **Replies:** 3\ **Last updated:** [January 13, 2026, 10:11pm UTC](https://discourse.slicer.org/t/body-composition-measurements-sma-smd-sat-vat-at-l3-level/45751 "2026-01-13T22:11:04Z")
Hello everyone, I need your help :folded\_hands: I want to measure the sma cm 2, smd hu, sat cm2 and vat cm2 values at L3 level CT dicom images. But the software gives me the cm 3 volume , sat and vat values , how ca… --- ## [Volume Rendering not working for MRI](https://discourse.slicer.org/t/volume-rendering-not-working-for-mri/45263)
**Author:** [@Maleia\_Tye](https://discourse.slicer.org/u/Maleia_Tye)\ **Replies:** 3\ **Last updated:** [November 29, 2025, 8:31pm UTC](https://discourse.slicer.org/t/volume-rendering-not-working-for-mri/45263 "2025-11-29T20:31:03Z")
As the title says, I’m not getting a 3D Volume rendering with an MRI. Preface: I’m able to get a 3D Volume view for a CT scan, this seems to only be impacting an MRI. Probably additional helpful information: My project… --- ## [Crash rendering very large meshes on macOS: Apple's OpenGL driver fails on glBufferSubData uploads over 2 GB](https://discourse.slicer.org/t/crash-rendering-very-large-meshes-on-macos-apples-opengl-driver-fails-on-glbuffersubdata-uploads-over-2-gb/48315)
**Author:** [@hherhold](https://discourse.slicer.org/u/hherhold)\ **Replies:** 5\ **Last updated:** [November 9, 2026, 12:11am UTC](https://discourse.slicer.org/t/crash-rendering-very-large-meshes-on-macos-apples-opengl-driver-fails-on-glbuffersubdata-uploads-over-2-gb/48315 "2026-11-09T00:11:26Z")
I ran into an issue with a very complex segmentation on an M5 Max (128GB RAM). A summary from Claude Opus 5.5 (with fix) as follows: Summary On Apple Silicon, Slicer crashes (\`EXC\_BAD\_ACCESS\` in \`\_platform\_memmove\`) wh… --- ## [Laptop requirements to do segmentation and volume rendering of wing imaginal discs](https://discourse.slicer.org/t/laptop-requirements-to-do-segmentation-and-volume-rendering-of-wing-imaginal-discs/47812)
**Author:** [@FlylabCHG](https://discourse.slicer.org/u/FlylabCHG)\ **Replies:** 4\ **Last updated:** [August 6, 2026, 3:34pm UTC](https://discourse.slicer.org/t/laptop-requirements-to-do-segmentation-and-volume-rendering-of-wing-imaginal-discs/47812 "2026-08-06T15:34:24Z")
I would like to know if anyone is using 3-D Slicer to segment wing imaginal discs of Drosophila larvae. I take images of discs that are too small to be isolated out of the larvae. They are labelled with gfp expression an… --- ## [Debugging application crash](https://discourse.slicer.org/t/debugging-application-crash/46531)
**Author:** [@sogo](https://discourse.slicer.org/u/sogo)\ **Replies:** 5\ **Last updated:** [April 5, 2026, 9:29pm UTC](https://discourse.slicer.org/t/debugging-application-crash/46531 "2026-04-05T21:29:45Z")
I am in process of merging our organization’s SW pipeline based on top of Slicer-4.11 into Slicer-5.10. While I am able to merge and resolve merge conflicts, my application is crashing on startup. I was following the sta… --- ## [Is there any way to know if a vtkMRMLNode has been renamed?](https://discourse.slicer.org/t/is-there-any-way-to-know-if-a-vtkmrmlnode-has-been-renamed/45717)
**Author:** [@Suhaim](https://discourse.slicer.org/u/Suhaim)\ **Replies:** 5\ **Last updated:** [January 13, 2026, 3:55am UTC](https://discourse.slicer.org/t/is-there-any-way-to-know-if-a-vtkmrmlnode-has-been-renamed/45717 "2026-01-13T03:55:36Z")
Hi all, If you create a markup node(vtkMRMLMarkupsNode) and add control points to it, the control points are named using a default format(“%N-%d”) with respect to the current name of the markup node. Renaming a markup … --- ## [Include functionality of control point status in custom scripted module](https://discourse.slicer.org/t/include-functionality-of-control-point-status-in-custom-scripted-module/45658)
**Author:** [@W.J.Heerink](https://discourse.slicer.org/u/W.J.Heerink)\ **Replies:** 6\ **Last updated:** [January 12, 2026, 4:34pm UTC](https://discourse.slicer.org/t/include-functionality-of-control-point-status-in-custom-scripted-module/45658 "2026-01-12T16:34:08Z")
Hi, I really like the use of the control point status as it is implemented in the Markups module. I mainly use the functionality of the buttons in the column of the table to change the status of individual control points… --- ## [ModalityConverter v2.0 - Remote Inference and Workflow Improvements](https://discourse.slicer.org/t/modalityconverter-v2-0-remote-inference-and-workflow-improvements/48513)
**Author:** [@ciro.raggio](https://discourse.slicer.org/u/ciro.raggio)\ **Replies:** 0\ **Last updated:** [October 14, 2026, 3:21pm UTC](https://discourse.slicer.org/t/modalityconverter-v2-0-remote-inference-and-workflow-improvements/48513 "2026-10-14T15:21:54Z")
I’ve been working on a major update to SlicerModalityConverter. Here’s a video introducing the new features, with two use cases: generating synthetic CT from a T1-weighted brain MRI and synthetic PET from a chest CT sca… --- ## [2026.04.21 Weekly Meeting](https://discourse.slicer.org/t/2026-04-21-weekly-meeting/46789)
**Author:** [@ebrahim](https://discourse.slicer.org/u/ebrahim)\ **Replies:** 5\ **Last updated:** [April 22, 2026, 4:42am UTC](https://discourse.slicer.org/t/2026-04-21-weekly-meeting/46789 "2026-04-22T04:42:38Z")
Title: 2026.04.21 Weekly Meeting Next Tuesday, we will be having our next weekly hangout at 10:00 AM ET until 11:00 AM ET. Anyone is welcome to join at this link: https://bit.ly/slicer-googlemeet-hosted-by-kitware A… --- ## [Add Segment to SegmentationNode uses invalid color values (scalar) and adds a new colortable node](https://discourse.slicer.org/t/add-segment-to-segmentationnode-uses-invalid-color-values-scalar-and-adds-a-new-colortable-node/45498)
**Author:** [@baderstine](https://discourse.slicer.org/u/baderstine)\ **Replies:** 5\ **Last updated:** [January 3, 2026, 11:28pm UTC](https://discourse.slicer.org/t/add-segment-to-segmentationnode-uses-invalid-color-values-scalar-and-adds-a-new-colortable-node/45498 "2026-01-03T23:28:36Z")
Summary: I am attempting to import/edit/export segmentations from numpy to slicer to numpy. I am using custom color tables but am getting invalid color IDs on export after a segment has been added. For example, my col… --- ## [Link a transform's visibility to transformed volume visibility](https://discourse.slicer.org/t/link-a-transforms-visibility-to-transformed-volume-visibility/45604)
**Author:** [@shai-ikko](https://discourse.slicer.org/u/shai-ikko)\ **Replies:** 5\ **Last updated:** [December 31, 2025, 4:19pm UTC](https://discourse.slicer.org/t/link-a-transforms-visibility-to-transformed-volume-visibility/45604 "2025-12-31T16:19:34Z")
Hi, In my application, I want to load a volume, and give the user controls to spin it around. So when I load the volume, I also create a Transform, make the volume observe it, and then call transformNode.GetDisplayNode(… --- ## [Load Failed over multiple formats (TIFF, NRRD)](https://discourse.slicer.org/t/load-failed-over-multiple-formats-tiff-nrrd/48018)
**Author:** [@asims](https://discourse.slicer.org/u/asims)\ **Replies:** 4\ **Last updated:** [August 30, 2026, 5:30am UTC](https://discourse.slicer.org/t/load-failed-over-multiple-formats-tiff-nrrd/48018 "2026-08-30T05:30:07Z")
Hi I have an image stack to load which was provided to me as a series of TIFF files. These can be successfully opened in 3rd party tools such as ImageJ (Fiji) and GIMP. However there is a warning message about the descr… --- ## [slicer dashboard](https://discourse.slicer.org/t/slicer-dashboard/46328)
**Author:** [@Fatima.k](https://discourse.slicer.org/u/Fatima.k)\ **Replies:** 5\ **Last updated:** [May 1, 2026, 3:58am UTC](https://discourse.slicer.org/t/slicer-dashboard/46328 "2026-05-01T03:58:02Z")
Hi there, Is there any way/possibility that I can use slicer viewer in web-dashboard as well as import/call some of the extension into the dashboard without needing to install and import whole slicer app into the dashboa… --- ## [pyradiomics 3.1.1.dev111+g8ed579383, is it safe?](https://discourse.slicer.org/t/pyradiomics-3-1-1-dev111-g8ed579383-is-it-safe/47416)
**Author:** [@aujinen](https://discourse.slicer.org/u/aujinen)\ **Replies:** 3\ **Last updated:** [June 26, 2026, 1:50pm UTC](https://discourse.slicer.org/t/pyradiomics-3-1-1-dev111-g8ed579383-is-it-safe/47416 "2026-06-26T13:50:26Z")
I downloaded PyRadiomics using git clone https://github.com/AIM-Harvard/pyradiomics and installed it using uv sync according to the contents of “pyproject.toml” with C++ build tools of Microsoft “Build Tools for Visual S… --- ## [Best tutorials and added tools for volume rendering](https://discourse.slicer.org/t/best-tutorials-and-added-tools-for-volume-rendering/46688)
**Author:** [@sulli419](https://discourse.slicer.org/u/sulli419)\ **Replies:** 6\ **Last updated:** [April 9, 2026, 9:52pm UTC](https://discourse.slicer.org/t/best-tutorials-and-added-tools-for-volume-rendering/46688 "2026-04-09T21:52:48Z")
The flexibility of the volume rendering feature is quite impressive, and it seems like this would be useful for finding things in 3D (not just making them pretty). Are there any good expert tutorials that go through how… --- ## [Custom application development Solutions](https://discourse.slicer.org/t/custom-application-development-solutions/46274)
**Author:** [@Tarang](https://discourse.slicer.org/u/Tarang)\ **Replies:** 1\ **Last updated:** [February 24, 2026, 1:27pm UTC](https://discourse.slicer.org/t/custom-application-development-solutions/46274 "2026-02-24T13:27:01Z")
hello everyone, I’m currently looking for the right custom application development solution for my organization. After browsing numerous websites and resources, I feel more confused than informed. A friend suggested I … --- ## [Using Cloud to run 3D Slicer](https://discourse.slicer.org/t/using-cloud-to-run-3d-slicer/47521)
**Author:** [@Poupak\_Kermani](https://discourse.slicer.org/u/Poupak_Kermani)\ **Replies:** 3\ **Last updated:** [July 5, 2026, 5:20pm UTC](https://discourse.slicer.org/t/using-cloud-to-run-3d-slicer/47521 "2026-07-05T17:20:00Z")
Hello, I do not have enough space in my laptop to run 3D Slicer. Could you please give me a step by step procedure on how to download and run 3D Slice using AWS Cloud service? Many Thanks --- ## [TotalSegmentator Partial Segmentation](https://discourse.slicer.org/t/totalsegmentator-partial-segmentation/47335)
**Author:** [@Arash1](https://discourse.slicer.org/u/Arash1)\ **Replies:** 3\ **Last updated:** [June 15, 2026, 2:46pm UTC](https://discourse.slicer.org/t/totalsegmentator-partial-segmentation/47335 "2026-06-15T14:46:54Z")
Any suggestions on why the segment is like this? \[DEBUG\]\[Qt\] 14.06.2026 13:36:34 (unknown:0) - Session start time …: 20260614\_133634 \[DEBUG\]\[Qt\] 14.06.2026 13:36:34 (unknown:0) - Slicer version …: 5.10.0 (revision… --- ## [Scissor Tool Not Working](https://discourse.slicer.org/t/scissor-tool-not-working/46214)
**Author:** [@jjjooosssiiieee](https://discourse.slicer.org/u/jjjooosssiiieee)\ **Replies:** 3\ **Last updated:** [February 19, 2026, 2:41am UTC](https://discourse.slicer.org/t/scissor-tool-not-working/46214 "2026-02-19T02:41:17Z")
I have a university project due tomorrow and am in need of URGENT HELP. I am creating images of mouse organs however once i find my organ i must use the scissor tool to cut away the excess however it is not working. I’ve… --- ## [How to show a transform in only one view](https://discourse.slicer.org/t/how-to-show-a-transform-in-only-one-view/46877)
**Author:** [@koeglfryderyk](https://discourse.slicer.org/u/koeglfryderyk)\ **Replies:** 4\ **Last updated:** [April 30, 2026, 8:39pm UTC](https://discourse.slicer.org/t/how-to-show-a-transform-in-only-one-view/46877 "2026-04-30T20:39:35Z")
I have a Displacement field Transform and I want to visualise it only in one 2D view. I couldn’t find it in the UI and I couldn’t figure out how to do it in python. Is there a way to do that? --- ## [Need advice on Segmentation of CT scanned fossil specimen (lungfish)](https://discourse.slicer.org/t/need-advice-on-segmentation-of-ct-scanned-fossil-specimen-lungfish/46817)
**Author:** [@sturiones](https://discourse.slicer.org/u/sturiones)\ **Replies:** 5\ **Last updated:** [April 24, 2026, 9:21pm UTC](https://discourse.slicer.org/t/need-advice-on-segmentation-of-ct-scanned-fossil-specimen-lungfish/46817 "2026-04-24T21:21:42Z")
Hi, folks! I am not an expert in 3D Slicer, I need advice from the community. I have a TM-scanned fossil fish skull with inner structures (canals for nerves and vessels) of rather low contrast (the slice below is after … --- ## [download fails/freezes on both direct connection and VPN (with academic license activated)](https://discourse.slicer.org/t/download-fails-freezes-on-both-direct-connection-and-vpn-with-academic-license-activated/47346)
**Author:** [@Tomy\_Roster](https://discourse.slicer.org/u/Tomy_Roster)\ **Replies:** 3\ **Last updated:** [September 29, 2026, 6:38am UTC](https://discourse.slicer.org/t/download-fails-freezes-on-both-direct-connection-and-vpn-with-academic-license-activated/47346 "2026-09-29T06:38:13Z")
I am using the TotalSegmentator extension in 3D Slicer to extract muscle and fat compartments using the tissue\_4\_types subtask. I have already successfully obtained and activated my academic license key. However, I am c… --- ## [Can not find 3DSlicer 5.9 version in preview releases, where is it available?](https://discourse.slicer.org/t/can-not-find-3dslicer-5-9-version-in-preview-releases-where-is-it-available/45242)
**Author:** [@MaxVs](https://discourse.slicer.org/u/MaxVs)\ **Replies:** 3\ **Last updated:** [December 6, 2025, 6:35pm UTC](https://discourse.slicer.org/t/can-not-find-3dslicer-5-9-version-in-preview-releases-where-is-it-available/45242 "2025-12-06T18:35:23Z")
I can not find 3DSlicer 5.9 version to download. Preview releases ends up on 5.8.1 version. There’s missing 5.9, where is it available? Thank you in advance. --- ## [Micro CT larvae with soft tissue](https://discourse.slicer.org/t/micro-ct-larvae-with-soft-tissue/47220)
**Author:** [@Rin\_2529](https://discourse.slicer.org/u/Rin_2529)\ **Replies:** 4\ **Last updated:** [June 3, 2026, 11:27pm UTC](https://discourse.slicer.org/t/micro-ct-larvae-with-soft-tissue/47220 "2026-06-03T23:27:49Z")
Hi everyone, I am working with micro-CT scans of mosquito larvae (~3.97 µm voxel size) and I am trying to generate rendered anatomical visualizations similar to the figures in this paper: https://www.nature.com/article… --- ## [Slicermorph- Segment Endocranium Taking Too Long](https://discourse.slicer.org/t/slicermorph-segment-endocranium-taking-too-long/47093)
**Author:** [@PitaChib](https://discourse.slicer.org/u/PitaChib)\ **Replies:** 4\ **Last updated:** [May 21, 2026, 11:15pm UTC](https://discourse.slicer.org/t/slicermorph-segment-endocranium-taking-too-long/47093 "2026-05-21T23:15:02Z")
Hi all, I’ve been doing rodent endocast with wrap solidify for a bit with success, but I’ve always been curious to try out segment endocranium feature automatically. Before I thought my computer was not good enough, but … --- ## [Viewer for different modalities at the same time](https://discourse.slicer.org/t/viewer-for-different-modalities-at-the-same-time/46896)
**Author:** [@Sahar\_KARIMI](https://discourse.slicer.org/u/Sahar_KARIMI)\ **Replies:** 3\ **Last updated:** [May 6, 2026, 5:37pm UTC](https://discourse.slicer.org/t/viewer-for-different-modalities-at-the-same-time/46896 "2026-05-06T17:37:54Z")
Good afternoon, I am working with 3D-slicer viewer and I want to be able to visualize different sequences at the same time, lets say comparing 2 image modalities/sequences at the same time (one be main and other transpa… --- ## [Apply composite affine + non-linear transform to 100k points](https://discourse.slicer.org/t/apply-composite-affine-non-linear-transform-to-100k-points/46993)
**Author:** [@sulli419](https://discourse.slicer.org/u/sulli419)\ **Replies:** 5\ **Last updated:** [May 12, 2026, 6:39pm UTC](https://discourse.slicer.org/t/apply-composite-affine-non-linear-transform-to-100k-points/46993 "2026-05-12T18:39:08Z")
Hi, I have a large ~10GB .h5 transform that I created within Slicer (affine+non-linear displacement field) by registering two volumes. I also have a spreadsheet that lists the XYZ coordinates of up to 100,000 points. … --- ## [DeCA module does not operate under the 5-4-2026.01.02 release](https://discourse.slicer.org/t/deca-module-does-not-operate-under-the-5-4-2026-01-02-release/45782)
**Author:** [@philippepellerin](https://discourse.slicer.org/u/philippepellerin)\ **Replies:** 6\ **Last updated:** [January 17, 2026, 9:53am UTC](https://discourse.slicer.org/t/deca-module-does-not-operate-under-the-5-4-2026-01-02-release/45782 "2026-01-17T09:53:06Z")
I tried running DeCA with the 3D Slicer 5-11-2026.01.02 release, but the module window opens like in the attachment, and the extension can’t be operated. --- ## [Fiducial Registration Wizard transforms](https://discourse.slicer.org/t/fiducial-registration-wizard-transforms/46770)
**Author:** [@Zaky\_Alfarizi](https://discourse.slicer.org/u/Zaky_Alfarizi)\ **Replies:** 4\ **Last updated:** [April 20, 2026, 9:59am UTC](https://discourse.slicer.org/t/fiducial-registration-wizard-transforms/46770 "2026-04-20T09:59:06Z")
I’m a beginner, I already have a calibrated pointer. I have a tracker at my object in real life, the pointer should be relative to the tracker on my real life object/reference, right? So my pointer transform will be calc… --- ## [SlicerNNInteractive: segmenting one structure erases part of an adjacent, already-completed segment](https://discourse.slicer.org/t/slicernninteractive-segmenting-one-structure-erases-part-of-an-adjacent-already-completed-segment/47792)
**Author:** [@Jean\_Pinson](https://discourse.slicer.org/u/Jean_Pinson)\ **Replies:** 3\ **Last updated:** [August 9, 2026, 3:28am UTC](https://discourse.slicer.org/t/slicernninteractive-segmenting-one-structure-erases-part-of-an-adjacent-already-completed-segment/47792 "2026-08-09T03:28:55Z")
Hi everyone, The new version of nninteractive in 3D slicer is huge !!! I’m using it on local on my desktop PC but I’ve now an issue that I hadn’t before where several structures are directly adjacent (e.g., bladder and … --- ## [My dental segmentator does not work please help](https://discourse.slicer.org/t/my-dental-segmentator-does-not-work-please-help/46408)
**Author:** [@TongJunLi](https://discourse.slicer.org/u/TongJunLi)\ **Replies:** 3\ **Last updated:** [April 12, 2026, 7:39pm UTC](https://discourse.slicer.org/t/my-dental-segmentator-does-not-work-please-help/46408 "2026-04-12T19:39:55Z")
--- ## [2026.08.11 Weekly Meeting](https://discourse.slicer.org/t/2026-08-11-weekly-meeting/47815)
**Author:** [@ebrahim](https://discourse.slicer.org/u/ebrahim)\ **Replies:** 4\ **Last updated:** [August 11, 2026, 5:58pm UTC](https://discourse.slicer.org/t/2026-08-11-weekly-meeting/47815 "2026-08-11T17:58:28Z")
Title: 2026.08.11 Weekly Meeting Next Tuesday, we will be having our next weekly hangout at 10:00 AM ET until 11:00 AM ET. Anyone is welcome to join at this link: Google Meet meeting 📅 Weekly Meeting · August 11, 202… --- ## [NDI Polaris Lyra + 3D Slicer OpenIGTLink: How to Keep Registration Valid After Moving the Phantom?](https://discourse.slicer.org/t/ndi-polaris-lyra-3d-slicer-openigtlink-how-to-keep-registration-valid-after-moving-the-phantom/47234)
**Author:** [@AdamDomafoldi](https://discourse.slicer.org/u/AdamDomafoldi)\ **Replies:** 4\ **Last updated:** [June 6, 2026, 5:14pm UTC](https://discourse.slicer.org/t/ndi-polaris-lyra-3d-slicer-openigtlink-how-to-keep-registration-valid-after-moving-the-phantom/47234 "2026-06-06T17:14:57Z")
Hello, I have been experimenting with the NDI Polaris Lyra and Slicer OpenIGTLink. I have read all the documentation and, after numerous attempts, I think I have some parts working, but I would like to ask for help. Wh… --- ## [Brain CT segmentation - grow from seed leak - rectangle appears](https://discourse.slicer.org/t/brain-ct-segmentation-grow-from-seed-leak-rectangle-appears/46245)
**Author:** [@mechanical\_orange](https://discourse.slicer.org/u/mechanical_orange)\ **Replies:** 4\ **Last updated:** [March 4, 2026, 12:26pm UTC](https://discourse.slicer.org/t/brain-ct-segmentation-grow-from-seed-leak-rectangle-appears/46245 "2026-03-04T12:26:41Z")
Operating system: mac os Slicer version: 5.6.2 Expected behavior: grow from seed only segments parts of the brain without the background Actual behavior: grow from seed segments the background in a rectangle form. Hi… --- ## [Viewing / Analysing RT Plans / Fields](https://discourse.slicer.org/t/viewing-analysing-rt-plans-fields/46683)
**Author:** [@AlexB](https://discourse.slicer.org/u/AlexB)\ **Replies:** 4\ **Last updated:** [April 9, 2026, 3:27am UTC](https://discourse.slicer.org/t/viewing-analysing-rt-plans-fields/46683 "2026-04-09T03:27:02Z")
Greetings, dear community! First off, thanks for this project–and for actively maintaining it. Now, I’d like to know if the program would cover my use-case, namely: Visualise dose distributions (in colour-wash mode) S… --- ## [3D Slicer Freezes When Enabling Markups ROI Interaction Handles](https://discourse.slicer.org/t/3d-slicer-freezes-when-enabling-markups-roi-interaction-handles/47905)
**Author:** [@vedat\_ozturk](https://discourse.slicer.org/u/vedat_ozturk)\ **Replies:** 3\ **Last updated:** [August 19, 2026, 6:48pm UTC](https://discourse.slicer.org/t/3d-slicer-freezes-when-enabling-markups-roi-interaction-handles/47905 "2026-08-19T18:48:43Z")
Problem report for 3D Slicer 5.12.3 win-amd64: \[please describe expected and actual behavior\] Dear 3D Slicer Team, I would greatly appreciate your help with a persistent and highly reproducible 3D rendering/freezing is… --- ## [Heat maps of trabecular bone](https://discourse.slicer.org/t/heat-maps-of-trabecular-bone/45796)
**Author:** [@Varsha](https://discourse.slicer.org/u/Varsha)\ **Replies:** 4\ **Last updated:** [January 19, 2026, 1:06pm UTC](https://discourse.slicer.org/t/heat-maps-of-trabecular-bone/45796 "2026-01-19T13:06:01Z")
Would anybody be able to advice how I can create heat maps for the trabecular bone of a particular skeletal element using Slicer? --- ## [Aligning STL anatomical models with MRI segmentations in 3D Slicer](https://discourse.slicer.org/t/aligning-stl-anatomical-models-with-mri-segmentations-in-3d-slicer/47983)
**Author:** [@Toumia\_Bessedik](https://discourse.slicer.org/u/Toumia_Bessedik)\ **Replies:** 4\ **Last updated:** [August 27, 2026, 2:11pm UTC](https://discourse.slicer.org/t/aligning-stl-anatomical-models-with-mri-segmentations-in-3d-slicer/47983 "2026-08-27T14:11:01Z")
Hi, I am working with an MRI of the head and I have existing STL models for several anatomical domains, including the skull, brain, soft tissue (ST), etc. I would like to use these STL models as references and align th… --- ## [Install ModalityConverter](https://discourse.slicer.org/t/install-modalityconverter/46308)
**Author:** [@jmarichal](https://discourse.slicer.org/u/jmarichal)\ **Replies:** 4\ **Last updated:** [February 28, 2026, 10:07am UTC](https://discourse.slicer.org/t/install-modalityconverter/46308 "2026-02-28T10:07:46Z")
Hi, New user here! I’m trying to download the ModalityConverter extension: GitHub - ciroraggio/SlicerModalityConverter. When trying via the extension manager, I got the following error message. So I went on extensions.… --- ## [How can I manually assign colors to structures in my 3D Model?](https://discourse.slicer.org/t/how-can-i-manually-assign-colors-to-structures-in-my-3d-model/47827)
**Author:** [@Nonso](https://discourse.slicer.org/u/Nonso)\ **Replies:** 3\ **Last updated:** [August 11, 2026, 2:02pm UTC](https://discourse.slicer.org/t/how-can-i-manually-assign-colors-to-structures-in-my-3d-model/47827 "2026-08-11T14:02:38Z")
Operating system: Windows 11 Pro Slicer version: 5.10.0 Expected behavior: Actual behavior: I imported a segmented model in .nrrd format, from MIB. After creating a model in 3D Slicer, using the model maker, most of t… --- ## [slicer.modules.SegmentEditorWidget does not exists anymore](https://discourse.slicer.org/t/slicer-modules-segmenteditorwidget-does-not-exists-anymore/47334)
**Author:** [@joachim](https://discourse.slicer.org/u/joachim)\ **Replies:** 3\ **Last updated:** [June 22, 2026, 8:19am UTC](https://discourse.slicer.org/t/slicer-modules-segmenteditorwidget-does-not-exists-anymore/47334 "2026-06-22T08:19:42Z")
I haven’t updated Slicer for a while, but now my .slicerrc does not work as usual. I have the line slicer.modules.SegmentEditorWidget.editor.findChild( "QWidget", "EffectsGroupBox" ), but in the newest Slicer version the… --- ## [Partial GPA idea for slicermorph](https://discourse.slicer.org/t/partial-gpa-idea-for-slicermorph/47387)
**Author:** [@Stephan\_Collins](https://discourse.slicer.org/u/Stephan_Collins)\ **Replies:** 3\ **Last updated:** [June 19, 2026, 5:24pm UTC](https://discourse.slicer.org/t/partial-gpa-idea-for-slicermorph/47387 "2026-06-19T17:24:27Z")
Dear all, Dear all, I am writing from a conference where I am learning a great deal about morphogeometry, which is quite far from my original background. One issue that has come up, and that I have also encountered wh… --- ## [ImageStacks module won't load full tiff stack](https://discourse.slicer.org/t/imagestacks-module-wont-load-full-tiff-stack/47016)
**Author:** [@Jknaub](https://discourse.slicer.org/u/Jknaub)\ **Replies:** 5\ **Last updated:** [May 14, 2026, 4:39pm UTC](https://discourse.slicer.org/t/imagestacks-module-wont-load-full-tiff-stack/47016 "2026-05-14T16:39:03Z")
Operating system: Windows 11 Slicer version: 5.8.1 Expected behavior: importing a tiff stack with the slicermorph ImageStacks (3,867 images) Actual behavior: only selects a subset of the stack Hello, I’m trying to i… --- ## [New extension pull request awaiting approval](https://discourse.slicer.org/t/new-extension-pull-request-awaiting-approval/46780)
**Author:** [@MaxHoges](https://discourse.slicer.org/u/MaxHoges)\ **Replies:** 4\ **Last updated:** [April 22, 2026, 4:58pm UTC](https://discourse.slicer.org/t/new-extension-pull-request-awaiting-approval/46780 "2026-04-22T16:58:12Z")
I recently got my BoneMat extension to a useful state and decided to try adding it to the extensions index. My first pull request to the ExtensionsIndex didn’t pass the extension validation test (which was initiated by a… --- ## [Is there an existing trame-slicer docker image?](https://discourse.slicer.org/t/is-there-an-existing-trame-slicer-docker-image/45481)
**Author:** [@rlhisey](https://discourse.slicer.org/u/rlhisey)\ **Replies:** 4\ **Last updated:** [December 19, 2025, 7:07am UTC](https://discourse.slicer.org/t/is-there-an-existing-trame-slicer-docker-image/45481 "2025-12-19T07:07:20Z")
Hi, I’m looking for a way to create a basic Slicer application on the web using trame-slicer. Ideally, I think I’d like to run it in a docker container to make it somewhat portable. Is there an existing, recommended dock… [Previous page](https://discourse.slicer.org/top.md?page=4&per_page=50) [Next page](https://discourse.slicer.org/top.md?page=6&per_page=50)